local coroutine = coroutine


coco = coroutine.create(function (a,b)
    print("resume args:"..a..","..b)
    yreturn = coroutine.yield()
    print ("yreturn :"..yreturn)
end)
coroutine.resume(coco, 0, 1)
coroutine.resume(coco, 21)
coroutine.resume(coco, 31)

--[[
    resume args:0,1
    yreturn :21
]]